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RPM Activated Window Switch MSD8956 Product:Activate and deactivate circuits, RPM modules used to activate the sw HoleShot 2400 Torque ConverterSuit GMRPM Activated Window SwitchActivate and deactivate circuits, RPM modules used to activate the switch MSD8956 D8956 The RPM Window Switch has two rpm adjustments; one to activate a circuit, while the other deactivates the same circuit. This switch will supply then remove ground to a circuit. This is a great feature to deactivate nitrous before the engine's rev limit is reached. The switch can be used with stock inductive ignitions or an MSD Ignition